Bioleaching of a Spanish complex sulphide ore bulk concentrate |
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| Affiliation: | 1. College of the Environment & Ecology, Xiamen University, Xiamen 361105, PR China;2. Xiamen Zijin Mining & Metallurgy Co., Ltd, Xiamen 361101, PR China;3. Zinjin Mining Group Co., Ltd, Shanghang 364200, PR China;4. College of Energy, Xiamen University, Xiamen 361105, PR China;1. University of Laval, 2325 Rue de l''Université, Québec, QC G1V 0A6, Canada;2. INRS – Institut National de la Recherche Scientifique, 490 Rue de la Couronne, Québec, QC G1K 9A9, Canada;3. University of Laval, 2325 Rue de l''Université, Québec, QC G1V 0A6, Canada;4. INRS – Institut National de la Recherche Scientifique, 490 Rue de la Couronne, Québec, QC G1K 9A9, Canada;1. Fundación Ciencia & Vida, Santiago, Chile;2. Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile |
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| Abstract: | In the present work the applicability of bioleaching using a mixed culture of mesophilic microorganisms (Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Leptospirilum ferrooxidans) on a bulk concentrate of a Spanish complex sulphide ore was studied. The bulk concentrate mainly consisted of by chalcopyrite, sphalerite and pyrite. Effects of nutrient medium, stirring, pulp density, temperature and the addition of CO2 (1% v/v) to the air flow were also studied. The highest leaching rates and recoveries were obtained with mechanically stirred reactors at 5% pulp density and 9K medium. However, by using 9K medium higher jarosite precipitation was observed. Results showed that the optimum temperature for copper bioleaching was 30°C, whereas zinc dissolution increased with a rise in the temperature. |
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